It has been only in comparatively recent years that any appreciable work has been conducted on equipment for the application of chemicals in the soil. Most of the early work was devoted primarily to methods of applying anhydrous ammonia and liquid solutions as fertilizers. In most of this work the principal injection tool consisted of a chisel-type applicator that released the chemical at a single point in the soil. In recent years, investigators have attempted to devise efficient and uniform methods of subsurface distribution. Hedman and Turner reported on a chisel-type applicator equipped with a “fishtail” to give more lateral spread to anhydrous ammonia. Arya and Pickard studied the effect of high pressures and velocities on the application of anhydrous ammonia, which was also single-point injection. Certain problems associated with the application of fungicides and herbicides in the soil have been discussed by Owen and Becker and Costel.